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Bad power supply, installed new one, get green light on mother board; but doesn't boot up. Bad start up button?

Emachine T3958 died. Installed new power supply, green light on motherboard; but it doesn't boot up. Could this be the start button?

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Yes, it is my belief that it is the Power On button. To test this, there is a simple solution. I however, would like to caution you at this point.
You will have the power supply plugged in. There will be a small spark. I wouldn't advise how to test the Power On switch, if I thought your safety would be compromised in any way. I just wanted to forewarn you of what you're dealing with.

You have a 20-pin or 24-pin motherboard power cable. It is the longest power connector in your computer, and plugs into the motherboard. (Not trying to insult your intelligence. I just simplify my answers, so there is no mistaking what information I put out)

This connector remains plugged into the motherboard. Where the wires go into this connector, is the backside of the connector. If you look closely at this connector, you will see those wires go down into individual socket holes. All the way down in each socket hole, is a metal terminal. The metal terminal is attached to the wire. It is a female terminal, and goes over a metal pin on the motherboard.

What I wish you to do, is to make a jumper wire, and stick the ends of this wire, down into two socket holes.
This jumper wire should be made of a thick wire, with insulation on it. It should be about three inches long. Strip about 3/4ths of an inch of insulation, from each end of the wire. Give each end a little twist, so that there are no strands of wire sticking out. Just a nice solid end. Bend this jumper wire into a U-shape.

You are going to stick one end of this jumper wire, down into a socket hole, and hold it there. You will then take the other end of the wire, and stick it into another socket hole, but just briefly. Just a momentary contact of about two seconds, or less. This is where there will be a little spark. Just enough, that if I didn't warn you about it ahead of time, you might freak out.

You will see a Green insulated wire going down into the 20 or 24 pin connector. You will see a Black wire next to it.
The Green wire is one socket hole that the jumper wire Must go down into. You can pick ANY Black wire. ALL the Black wires are Ground wires. That's why you can use any one of them.
The Green wire is the Soft Power On wire.

The link below will show you an average 20-pin ATX main power cable. I just referred to it as the 20-pin motherboard power cable, above, for ease of reference. Hoping you may recognize it by that description, better.
The photo all the way to the right, on this page, shows you the Green wire I'm speaking of. You can see the Black wires also.

You may wish to wear rubber dishwashing gloves, on your hands as you do this. It isn't all that bad, but I just thought this might make you feel safer. There are some people that do this procedure with a paper clip, and tape wrapped around the middle. I don't advise this.

If you take this jumper wire, and stick it way down in the sockets, so that you're sure it's touching the metal terminal down in there, and the power supply doesn't turn on, then you have problems with the power supply. Check the surge protector the power supply cord is plugged into.
Just because you see a power on light that is lit up, on the surge protector, Don't assume it's okay. You need to check THE receptacle the computer is plugged into. I use a table lamp for this.

I have had, where everything else was getting power from a surge protector, and not the computer. Turned out to be One bad receptacle in that surge protector.

Also, since your computer uses an Intel Celeron D 340 processor, make sure the 4-pin ATX power cable from the power supply, is plugged into the motherboard. It will have a female socket on the motherboard, and have -> CPU, next to it. (Square design plug. 2x 2 sockets in it. Has two Yellow wires, and two Black wires. The Yellow wires are 12 volt wires)
This is power for the processor. The computer will not boot up, unless this power cable is plugged in.

Posted on Apr 15, 2009

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My gateway 503gr will not power on when you press the power button has power to mother board every thing is plugged in there is a green light on the power supply and the mother board and the power switch...

This could have a bad power supply (in this case I would try a new one just in case).
All other things being normal, I would guess a bad motherboard.
The best thing to do is disconnect everything but the CPU and memory and try to start it.
If it starts, then start connecting stuff until it doesn't start--this will tell you what is bad.

Apr 13, 2011 | Gateway 503GR PC Desktop

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Bought new power supply, no difference power button will not even go on or light up ; however small green light on mother board lights up. als accidentaly disconnected the switches wiring to the mother...

The green light just show that the motherboard is getting power.
The power button of the front of the case is connected to the mother board, not to the power supply, usually in the extreme lower left corner along with the with the HDD and Reset Button cords; Power button wire are labeled and usually red/black.
If all wired correctly, possible bad or stuck power button or reset button.
Hope this helps.
Please rate this answer by check rating "Hands"

Feb 08, 2011 | E-Machines T3958 (827103050974) PC Desktop

1 Answer

Emachines t3958 wont power on

The green light means there is standby power to the motherboard.
Power button may be broken, does it 'click'?
With the case open, do any of the fans start, then stop?
If yes to the above, you may have a bad power supply. Can you borrow one to try?
Last test before it's the chip or mother board:
Remove the connectors for power from drives, video card, all but the motherboard (Do NOT disconnect small connectors on the motherboard, just POWER from the drives and video card)
Remove any expansion cards except video. Note where they go.
Try again. If it starts and fans run ok (video may not work but fans go normally.), shut it off, reconnect the video card. Try again, power off, connect or install one thing at a time until it stops running again. The last item plugged in is the culprit.
Always one item, power on, try it, then power off, try the next one.

Apr 02, 2010 | E-Machines T3958 (827103050974) PC Desktop

1 Answer

No power,power supply seems ok,green light on mother board on. when pluged in the fan runs for a couple seconds and turns off.power button has no effect.

sounds like a mother board issue,

start with pulling out all ram chips and re try,,

then try pulling all cards out like old modem and also cdroms.

if ever thing but power is unpluged its a bad mother board or CPU chip

Mar 12, 2010 | E-Machines T3958 (827103050974) PC Desktop

2 Answers

Emachine T3958 wont turn on

make shure that the 4 wire plug to ther mother board from power supply is plugged in..other wise try a new power supply

Oct 09, 2009 | E-Machines eMachines Desktop PC

1 Answer

Emachine will not power up

By nothing else, from a technical standpoint this would mean literally nothing, the CPU fan, power supply fan, aux fan, disk drive not spinning up, etc. My experience with EMachines is their motherboards aint the best, have been known to take out hard drives and other peripherals to the mother board. If you are technically inclined the first thing to do is to bare out the system, Power Supply attached to the Mother Board w/ Cpu Monitor and Keyboard no Hard Drive and no Non esential boards installed, very carefully remove the memory and start it up all should be fine except it should give you a long beep from the PC Speaker indicating the Mother Board is aware there is no memory installed if it will not do this most basic of tests this is not good. If it does give you a health beep continue to install one item at a time, first the memory, the display should, if working, tell you there is a boot failure, of course, the hard drive is not connected, do so and keep on testing. Without knowing what type of mother board you have, most likely an AT with integrated peripherials the process to determine exactly what the problem is would take hands on trouble shooting. If you dont get the beep indicating the mother board cant determine if memory is installed and truley nothing else is on it is more likely the mother board. There are several good ones online that will fit your case if you want to go this route. Or is it time to upgrade ?

Jun 04, 2009 | E-Machines eMachines Desktop PC

2 Answers

I have a emachine PC. PowerSupply blew up. changed it still down

try to remove the memory and put it back again make sure put it fit and correctly

May 28, 2009 | Intel D845EPI (INTELKD845EPILPAK10)...

2 Answers

No boot, New PS, Green light on MB lights, No Fans running

Bottom line: Either your power supply or (hopefully not) the mother board has gone bad.
Replace power supply (remove old one), take to local independent computer shop, ask them for new unit. Should be around $50.00. - no more. After reinstall, if still no fans, boot, etc. Replace motherboard or buy a new machine. MB's installed probably will run you around $250.00-ish.
Good luck.


Mar 21, 2009 | E-Machines eMachines Desktop PC

1 Answer

Emachine t3958

First check to see if a drive died. Unplug all the drive Floppy, hard and dvd or burns. I have come across many time that a drive will die and keep motherboard from booting. Being that you say you get a green light on the motherboard shows that the power suppy is providing some power. But for some reason the internal self test is faulting the power suppy. I have not come cross any bad power supplies killing a motherboard. But I have come across power supplies killing drives. The power switch is a normal open switch so the only time you be able test continuity on it is if you hold the switch in, or the closed position.

Apr 03, 2008 | E-Machines eMachines Desktop PC

1 Answer

Pover up trouble

sounds like something is drawing down on your 12 volt supply drives or on board regulators. Try it without the drives connectged, and see if you can get the system to boot up(you'll just get a notice that your drives are unavailable, but you'll already know that, right?

got backup for your Dell?

Feb 15, 2008 | Dell Dimension 5100 (D51L1) PC Desktop

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